The problem with using Mythic Adventures to extend play beyond 20th level is that you need to plan ahead to a certain extent. If the party is 10th level when you introduce the mythic rules, that would work fine. But if they are already 19th or 20th leven when you bring them in, it won't work as well because the mythic rules seem to assume that you are still gaining ordinary levels as you gain mythic tiers.
If your player characters are approaching 20th level and you have decided that you don't want to stop there, you need to decide at that point just how far you want to go beyond 20th level. The three options I am aware of (Pathfinder core rules, Little Red Goblin Games' Legendary Levels, and Jesse Jones' Epic Pathfinder rules) all have different implications at 21st level and beyond, so your players will need to know enough to plan accordingly. The main basis for deciding which to use seems to be just how far beyond 20th level you plan to go:
Yeah, I'm not sure where you're getting that but Mythic Adventures doesn't assume anything about level progression in relation to Tiers (other than what should be the minimum "acceptable" level for certain Tiers). Mythic Tiers, being entirely independent from Levels, have no impact on Level progression or non-progression beyond the obvious of allowing parties to fight more powerful encounters than normal and thus gain experience faster. But a party can progress in a campaign designed to provide one Mythic Tier every two levels or a campaign where they gain no Tiers until after level 15 or 20 with no adjustment to the rules as written.
The Pathfinder Core Rules option was a placeholder until Mythic came out. Pathfinder (as a Campaign Setting) is designed with a hard Level cap of 20 in mind. I've got one campaign going right now where the players are gaining one Mythic Tier every four levels (on average), and another campaign setup and ready to go after this one in which the party will hit the level cap of 20 first before starting to gain Tiers (with no more levels being gained). Both of these campaigns required the exact same amount of work - using the core rules with no adjustments and building adventure scenarios around them.
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I would dearly love epic rules (for total character levels 21 and above.)
I'd also dearly hate to GM or even play that character more than once a year.
I GM a group of characters- one is level 21, the other level 18. It becomes very difficult to keep track of encounters and design them.
But at the same time, I know they enjoy this. I enjoy high-level play sometimes, too. I enjoy that colossal dragon encounter. The problem is, it becomes so easy for the player to negate all the GM's work without the GM metagaming the encounter.
For instance, the player may cast wish or teleport or other various spells with the use of items or class abilities. It is very very hard to design an encounter that neutralizes these (perhaps it's not even fair).
As much as I wish Paizo would, indeed, make epic level material, I think I'm ok with Mythic being that. I would rather Paizo focus on everything they have been than lose that focus on designing epic. Sometimes, it's just time to retire a character or work with the GM on ascending.
What I do urge Paizo to do is put this to rest and do something with ascension to godhood via the Starstone (not quite like Mythic). That could put the finishing touch on that level 20 guy.
I don't recall exact details, but I did work it out back when Mythic Adventures first came out. Create any character you like and advance him to 20th level. Then start adding mythic tiers but no further levels. I would be very surprised if you don't run into some problems that make many mythic abilities useless since you cannot gain any more actual levels.