Babe - to summarise? It will complicate things, yes. However, now you and all other readers of this thread are aware of the descent speeds many operators are now flying, it is to be hoped that all will plan accordingly, and the problem will largely disappear.
Out of interest, ballpark figures yesterday for a 737 NG from FL410 showed 1.4 minutes less at cruise consumption and an increase in overall time of just over 1 minute for descent at .74/250 as opposed to .78/280 (standard 250kts at FL100). Fuel saved is estimated at around 30kg (certainly no 'advantage' on the arrival fuel computation = nearest 100kg). Not sure it is really worth it, trading fuel v other costs? A lot more can be saved in other ways.