The trouble is the IOC would probably not keep such a plan around long enough to get to the second cycle of the hosts.
I think as things are now that they've dropped any pretence of a transparent bidding process they should probably seek to lock in 2030, 2034 and even 2038 probably out of a pool of former hosts, but I think it would be foolish to look much further ahead yet and it is still important that the IOC doesn't block out potential new hosts - there are certainly a few who though new to the Olympics wouldn't be new to hosting Winter sports events.
I do think the sensible compromise for both the summer and winter games to slash bidding costs and encourage both new and former hosts to bid is to award on a two episode cycle, perhaps even with the caveat that for the Winter Games at least one of those two games would go to a former host.