I really think there is a fast and simple constraint on UTXO bloat which can be done:
Allowing the existing free transaction space to be used for tx which reduce UTXOs (i.e. negative delta) instead of being based upon the number of days destroyed, which was to encourage old coins being spent, something less important.
i think that's a really good idea.
from reading about how different wallets choose from different UTXO strategies to include in tx's (i think they all do it differently), this could be a no brainer which could help immensely.