Yeah, I found a used pre-pro for my AV system for all the legacy ports. Around 2010 vintage they had both plenty of analog and HDMI during the transition period. Picked a manufacturer known for signal quality and product longevity. And for less than one fourth of the original price.
Lots of little boxes on Amazon will convert your legacy RCAs to digital (and back). But will it eventually all go to wireless? No ports at all!