Not to be contentious but CDPs are a very mature product with a long life ahead (with room for improvement).
DACs and streaming does indeed have SO MUCH upgradability in store. It seems to take mere months to read of something newer and better. No need for a fancy new case or an upgrade but a whole new way of addressing that bit perfect need.
There's still a long way to go so don't overspend on something that will be bettered in a matter of months. Tread carefully: this hobby should be fun, not frustrating. Make sure to try out whatever you think you need before buying.
All the best,
Nonoise