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I think it is very important that all mythic spells should remain useful all all levels of play. Otherwise, you'll have situations where characters who gain their mythic tiers late in the game will have better mythic spells than characters who gained their tiers at low levels since they had a wider variety of choices. Either that, or you should allow casters to replace their mythic spells with new ones as they gain tiers, similarly to how sorcerers can replace their spells as they gain levels.
It is important to make sure that mythic spells are always in some way better than non-mythic spells when they are cast at the same level. Or at least they should be useful in some unique (and mythic) way. Otherwise, the caster will ignore the useless mythic spells in favor of recasting his better spells with Divine Surge or Arcane Surge.
For example: why would a high level Hierophant Cleric ever cast mythic cure light wounds or cure critical wounds when he could simply use either Recalled Blessing or Inspired Spell to cast Heal? Heal is better in every way when compared to the Mythic Cure spells, and by using Recalled Blessing or Inspired Spell, he didn't even have to expend a spell slot.
Think if it this way: Using a mythic point to cast a mythic spell should always be at least as effective as using Recalled Blessing or Inspired spell (or the equivalent arcane versions) to recast one of your most powerful spells. This means that with the current way things are set up a 1st level mythic spell has to compete with 9th level non-mythic spells.
One suggestion for making mythic magic (as opposed to normal magic enhanced with mythic power) more useful: make it immune to non-mythic anti-magic fields. Otherwise you can bet that some non-mythic parties are going to destroy mythic spellcasters by trying to keep them in antimagic fields.