While you could use the B2 as a CD player, I'd bet that you would, sooner or later, rip your remaining CDs. Having the whole collection in one place, searchable and playable from the well-designed Brennan app or Web UI, without ever having to open a CD case again, would be too tempting.
You might also think the B2 DAC and amp is not quite what you're used to in terms of the analogue output to passive speakers so again, sooner or later, you might go for an external, combined DAC and amp. Which could also solve the turntable issue if it had a phono stage. There are some great small amps out there - the PS Audio Sprout is one, mine is a NAD D3020 v2 (also with a MM phono input).
The B2 is a great multi-source device, especially via its optical output: as well as your CD collection you have very user-friendly internet radio, the inspired YouTube music search function and also Spotify Connect if you have an account.