Ethereum hasn't exactly had the best history when it comes to a clean code, and Ethereum Classic is a testament to this fact.
Changing, altering, or modifying something as massive as the Ethereum network, while it's still in operation, is no easy task.
In fact, many reference it to an airplane mechanic crew, attempting to repair a plane while it's still in flight.
Now, I am no fan of Ethereum, and I'm actually a devout fan of EOS, just to be fair and open here, but Metropolis feels rushed.
Like some sort of publicity stunt in order to woo the price of Ethereum in my opinion, so if I were you, I'd sit out over on the sidelines in Tether... until this upgrade has been proven.
Just my two Satoshi's here, what say you?