Out of curiosity, what would be an acceptable bridge to you, then? Was it fine being a potentially amazing ability that might never amount to anything in a game, as long as it fulfills it's stated goal of being "divine intervention"?
Do you see a path towards it being something that might actually happen without a reduction in power or scope?
Personally, I find the idea that any random 10th level Cleric, on any given week, has a flat 10% chance of invoking the full power of their deity regardless of circumstances to be a fairly ludicrous ability. Especially from a world-building outlook- is this something every "priest" has access to? Should I start giving every high-level NPC who is a divine caster a 10% chance to evoke godly power? How would that impact my setting or encounters?
Especially in the hands of evil and chaotic priests? Divine Intervention, if it is possible, should be a DM choice, not an enumerated ability of a character class- that cheapens it way more than being a "mere 5th level spell".