Well, I too now am in the situation where the last expansion has been made, where 80 runes have been accumulated and where the bomb count is at 15.
I have a very simple and EASY to implement request to TL while we wait for further expansions: when the first Storybook came round, the game was made intelligent enough to raise the rune cap to 150 for those who were then maxed out. So, knowing that such conditional logic was possible back then, can you please do something similar for those who are maxed out now, by entirely removing the bomb and/or rune cap for all players or at least for the maxed out ones?
If TL implements that very simple fix, at least we can continue to accumulate the material to play catch up when new expansions arrive, so that would take away a bit of the pain of not being able to expand further...