When the Scottish independence vote was being agreed two or three years ago, Salmond pushed for three options - Yes, No and Devo max. The No campaign saw that this would split their vote, and wisely pushed for a straight Yes/No choice.
This also gave the No campaign the ability to offer Devo max if things were looking tight, which duly happened. Whether they planned that far ahead, who knows?
When devolution was first introduced in the nineties its extent was limited, partly at least because giving further powers would raise the West Lothian question. In fact, even the limited powers given raised it, but it was pushed aside.
Once Devo max was offered in the independence campaign, it should have been clear that this would again raise the West Lothian question in the event of a No vote. Given that No votes, so many powers are now to be devolved that it is simply unfair on the English that they don't get to decide on so many issues for themselves - the issue can not be pushed aside this time.
So you can clearly see the logic for why EVEL (English Votes for English Laws) is a natural consequence of the whole devolution -> independence vote -> devo-max process, and it makes perfect logical sense.
The politics of it is more subjective, however. Personally, I think the West Lothian question has been debated for so long and is so well understood that not a lot more research is needed. No solution is glaringly better than the others, so one solution simply has to be chosen and got on with. Also I think that a matching timetable for devo-max and EVEL is logical and fair, since they are two sides of the same coin.