I guess soon enough we will find out whether Nova or Yobit have solved the issue already or simply not encountered it yet.
If there is scaling problems, why not to create 2,3,4 wallets instead of one? Sigt is just another fork with standard leveldb implementation. What kind of bullshit about enterprise level you talking about? And POW stage will end in 11 days, so amount of micro transactions from miners will drop.