My advice do nothing on conversion yet !
Given that the 15hr conversion route does not appear to be disappearing now, or (in the UK) after July, I would concur.
The factors which would make me suggest people buy their anti-EASA insurance sooner would be
1) Ending of the 15hr conversion route
2) New exam TK with no QB
3) Some other nasty like a ban on IR training or IRTs in an N-reg (possible currently only in the UK and, I gather, in Belgium, from vague memory of some very recent info). There are multiple scenarios here which I won't go into (don't want to give the usual idiots any ideas) but suffice to say it would result in every owner simply going to Spain or Greece, which is probably a sufficient regulatory disincentive
Currently we have
known derogations in UK (2yrs), Germany (1yr), France (2yrs) and the Netherlands one I am waiting for a "CAA" URL on.