If I rip all my CD's to flac files do I still need a CD transport?

What happens when your hard drive chashes?  If you have the Cds, you can still recover the music. Do you have a storage space problem. I put my CDs on hard drives, but I still keep the media - just in case.

What happens when your hard drive chashes?

That's what backups and restores are for.   ITs' important to not overlook that because eventually every hard drive will fail.  Keeping the CDs is another safeguard but ripping thousands a second time is not a desired use of time.  So unless you want to be forced to go back to a CD player at some point,   have that backup and restore solution in place.  OR at that point punt and go mostly with streaming from services like qobuz, etc.

Simple...

I had 2 hard drive of 5GB  ... One conected all the time...

The other is a safe...

What happens when your hard drive chashes?  If you have the Cds, you can still recover the music.

I have 3 copies of my music library, one master and then two backups. It is super simple and cheap to backup a music library. In fact it is orders of magnitude easier than saving CDs and then potentially re-ripping the audio files.

Yes all HDs fail eventually. One thing that helps a lot is to NOT keep your music library files on your boot drive. If your library HD is on a separate disk (or NAS  drive etc) it is MUCH less likely to crash and burn. That outcome almost always goes to the boot drive. 

All of my CDs, about 1k, have been ripped to FLAC files, and reside on my server. I stream Tidal, but mostly listen to my CDs and I still buy CDs. I have  a Cambridge CXC transport, but it doesn't see much action. As of now, I have no plans on getting rid of NY CDs.