Do you think as fans we get hung up too much on the idea of a 20 goal a season striker? Statistics from the Premier League era are quite interesting: http://hitrowz.com/2013/07/14/the-myth-of-the-20-goal-a-season-forward/
Interestingly on the list of players to hit 20 in a season, three of them are midfielders (Le Tiss, Lampard, Bale). I'd consider these players more valuable that a forward who achieves the same milestone. If you have both you're going to be pretty hard to beat (i'm thinking Lampard and Drogba for Chelsea).
The more goals strikers get the better (or players anywhere on the pitch). This is obvious. Providing examples of teams winning the league without a 20 goal striker is completely irrelevant. They'd have won it by even more with one.
Interesting question, and not one that this article helps answer at all. Looks impressive, but surely there is the question of the number of goals scored around the team and how many are conceded. When big Ron scored a zillion goals a season we were still crap, as a team of OAPs could score at least 3 against us. We also lacked that second scorer. If Rickie and Jay score 30 goals between them next year, with the midfield and centre backs chipping in with a few we'll all be happy - provided our defence is as tight as the proverbial duck's.