I think, ideally, it would change.
The trouble becomes one of the correction which is needed weakening bases that already exist. This will, I think rightly, anger players who have spent significant resources, either real or virtual, to acquire a particular level of power.
I really think only a few towers may be overpowered, and many are underpowered or do not really work as I think they were originally intended (based on descriptions). If all towers were properly adjusted at one time and put on similar (or identical with different starting points) curves, not only would progression be greatly simplified, but we would see more diverse defense arrangements, reliance on other towers, and no more “ideal” defenses, since what works well against some dragons would not work well against others. Also, making more towers relevant again would reduce the weakening, since many towers that have not been used would actually be stronger. The net effect is that the game would be more interesting, and there would be no one strategy that is more or less universally seen as acceptable/ideal.
The flip side is that there needs to be more viable dragons of every class and element. I think we all recognize that spell sets make or break a dragon. Certainly, power and HP matter, but not nearly as much as the right combination of spells. This could partly be corrected by allowing for players to forge spells we cannot presently forge. But really, dragons should be revisited, and if any changes are made, runes should be placed back in storage (or just remove all runes for everyone if this change is made–I doubt many would find the inconvenience of redoing runes outweighing the benefit of being able to reclaim rune on dragons no longer needed).
The two issues (towers and dragons) are interlocked. The puzzles must be solved simultaneously. If not, then whatever side is not fixed will be broken (either OP dragons or OP bases).
I’ll post that spreadsheet so those who are interested can see what I did. You will want to look at it on a computer though.