He is promising, though imo he didn't yet had to tackle big downturns, misfortunes or big pressure for that matter. Mikkelsen already has at least 2 challenging periods behind (1. WRC stop and spectator-killing crash, 2. first half of 2011 IRC season) .

Neither did Tanak manage something like Ogier when he drove WRC first time in wales 2008 and won the first stage...

Btw. remember that at the end of 2004 the two ford pilots (Martin and Duval) looked like those who will rule the sport in the future (together with Loeb), both were out of it just a year later.