Eventually I am sure .. but .. Deal or No Deal, The Biggest Loser, and Extreme Makeover Home Edition, Dateline & 20/20 .. aren't produced in HD anyway. So you're not missing much by CH or A-Channel airing them.
As for a timeline for them going HD, I'd say 5-10 years dependent on who buys the A-Channel network. In some markets they may never be upgraded beyond SD digital, some may only exist in HD on cable/dth as well. Kinda like Global-HD which doesn't actually transmit OTA yet exists on cable/dth mostly for simsub reasons.