To be honest, with all the issues with MultiBit classic and MultiBit HD at the moment... and the complete lack of updates from the developers... leaving your coins in MultiBit is a bit of gamble regardless of whether or not there is a fork. Just check all the threads in this board with people having issues.
The ONLY thing in their favour is that MB Classic supports exporting your private keys... so you'll be able to "rescue" your coins relatively easily... and MB HD uses BIP39 mnemonic from which you can somewhat easily derive your private keys (ie. by using
https://iancoleman.github.io/bip39/)...
Given that the devs have declared Classic is no longer supported, don't expect any updates for BIP148 ever... and given that MB HD has not been updated since March despite so major errors, don't expect an update for BIP148 any time soon
