It's a very subjective question, but I certainly wouldn't be paying serious cash for a load of Avios against some soft future ideas of travel. I think there's likely to be a devaluation (I don't know anything here, but tend to assume the worst) so unless you have a specific plan in mind I'd suggest you hold on to your cash.

The other thing to do is to check price and availability as well as prices on the sort of trips you take. If you're happy to do ex-EU then you may well find that for little more cash, you get complete freedom of dates and schedules, plus TPs and Avios. Especially if you can wait for sales and then decide on trips.