I'm thinking these opinions are mainly to be stated and not responded to, but what the heck...
tennisville said:
There was never a big 4 at the same time. It was always either a Big 2 or Big 1 and Murray was never a part of that group of 3
I think this is basically true except for one year: 2012. All four of the Big 4 won a Slam and they were relatively close together. So it goes something like this:
Big One: 2004 (Federer)
Big Two: 2005-06 (Fedal)
Big Two + One: 2007 (Fedal + Djokovic)
Big Two + Two: 2008-10 (Fedal + Djokurray)
Big One + One + Two: 2011 (Djokovic + Nadal + Fedurray)
Big Four: 2012
Big Two: 2013 (Nadalkovic)
Big One + Two: 2014 (Djokovic + Fedal)
???: 2015
Ok, that was confusing and a bit silly. But my point is that--to agree with you--the dominance has moved around, but that there was actually one year, 2012, that could be considered the Year of the Big Four. And of course if we want to be generous we could call 2008-14+ the "Era of the Big Four" in that over those seven years (and perhaps more), those four were by far the dominant players in the game.
If you look back at 1973-81, you'd see a similar situation with Connors, Vilas, Borg, McEnroe, and Lendl.
federberg said:
There was never a weak era. Just a time when no one player stood out. Over time tennis players get better and better...
Yeah, maybe. But I think both are true - that players get better and better (overall), but that talent also fluctuates. Macro and micro cycles. For instance, I think it clear that the field was much stronger in the mid-80s to early 90s than in the late 90s to early 00s, even if the overall (longer term) trajectory is towards improvement.
Talent also pools in different ways. Sometimes it is centered on just a few players with a big drop-off after that (e.g. the Big Four and everyone else). But sometimes it is more evenly dispersed and/or the "curve" from the elite to the near-elite is more gradual.
The nice thing about the era we're transitioning into is that there is going to be more dispersal. Actually, there already is in my opinion, as evinced by the fact that Wawrinka and Cilic won Slams last year. While I think Djokovic, Nadal and Murray will still take home the majority of Slams in 2015 to maybe 2017, the gap is slowly narrowing. But the Big Four aren't getting any younger and as they age and slowly decline, the lesser talents below them will be a bit closer in the rearview mirror and, at some point, will equal and then surpass them.
Generations rise and inevitably fall. Nadal/Djokovic/Murray are of an age that the baton would be starting to be passed if there was a strong young generation coming up. But as I've said before, I don't think the upcoming generation (age 21-25ish) is going to surpass the current elites; at best they'll rival them as the older players decline and the younger players peak. For a new level dominant group we might have to wait for the next generation, currently age 16-20ish (e.g. Kyrgios, Coric, Zverev, etc).
So we might see something like this, in terms of which generations are dominating the stage:
2001-06: Generation Federer (with Nadal alone creeping in the last two years)
2007-09: Transition
2010-15/16: Generation Nadal/Djokovic
2015-17: Transition
2018-?: Generation Kyrgios/Coric/Zverev
Or something like that. I might do an actual study of the top 10 for different years and figure out a ranking system to see "Generational Top 10 Dominance." Sounds like a fun way to waste an hour or two.