Using the OP albeit with some tweaks.. my rough analysis of what was the greatest decade for players and teams is as follows (in order to avoid it getting too subjective, I'd award points to the top 3 and perhaps a minus for the weakest side):
PLAYERS
Goalkeepers
1) 1960's (10 pts)
2) 1970's (8 pts)
3) 2000's (5pts)
4) 2010's
5) 1990's
6) 1980's
7) 1950's (-2 pts)
Full backs
1) 60's (10pts)
2) 90's (8pts)
3) 00's (5 pts)
4) 70's
5) 50's (on paper they should be first - but having watched Brazil of that era closely, I simply don't rate Nilton Santos that highly - Djalma on the other hand is alongside Carlos Alberto as my top two right backs of all time, phenomenal player).
6) 2010's
7) 80's (-2pts)
Centre backs
1) 70s (10 pts)
2) 80's - I personally think Baresi's peak falls in 80's (8pts)
3) 00's (5 pts)
4) 90's
5) 2010's
6) 1960's
7) 1950's (not enough strength in depth in this category) (-2pts)
Midfielders
1) 80's (10pts) stacked as feck
2) 60's (8pts)
3) 50's (Varela and Didi.. dayum) (5pts)
4) 90's
5) 10's
6) 70's
7) 00's (-2pts)
Wingers/Wide Forwards
1) 10's (10pts)
2) 60's (counted Garrincha for this too based on 1962) 8pts
3) 50's (5pts)
4) 90's
5) 00's
6) 70's
7) 80's (-2pts)
Support Strikers/10's
1) 80's / 60's (10pts)
2) 50's (8pts) - I would see Puskas/Di stefano falling into this category due to their positioning at their peaks
3) 90's (5pts) - if you give this era Zidane and Rivaldo
2) 70's (5pts) - Cruyff factor
4) 00's
5) 10's (-2pts)
Centre Forward
1) 90s (10pts)
2) 50's (8pts.. Kocsis, Fontaine and Nordahl - kapow!)
3) 00's (5pts)
4) 60's (not really many out and out strikers.. more 9.5's)
5) 80's
6) 10's
7) 70s (apart from Muller it lacks depth) (-2pts)
PLAYER POOL RANKINGS...
1) 1960's (38 pts)
2) 1980's (24 pts)
3) 1990's (23 pts)
4) 1970's (21 pts)
5) 2000's (18pts)
6) 1950's (17pts)
7) 2010's (8pts)
TEAM RANKINGS
1) 1970s* (20 pts) * does that Brazil team count towards culmination of 60's era perhaps as it falls at end of 69/70 season rather than being a 70s side?
2) 1950s (15 pts)
3) 2000s (10 pts)
4) 1980s (5pts)
5) 2010s/1960s
6) 1990s (-5pts) *punished for its very weak national sides
OVERALL RANKINGS
1)1970's* (41 pts)
2) 1960's (38 pts)
3) 1950's (33pts)
4) 1980's (29 pts)
5) 2000's (18pts)
5) 1990's (17 pts)
7) 2010's (8pts)
SUMMARY
Its a tough one, IMO overall the 60's era is the strongest but it depends on the classification of the 1970's side as that was a side which was so early into the decade, it can't really be referred to as a side which defined an era per se... but generally speaking even without that side the 70's era from a team perspective is so strong with two all time level club sides and two all time level national sides even excluding Brazil.
Player wise 60's won by a large margin, but 80's pool was strong. The sides from the 50's suffered due to lack of organisation around certain events such as European Cup/European Championships and people finding their feet post War... some outstanding sides from that period though. For me one thing is for sure, the modern era seems to my eyes to be the weakest in terms of individual quality outside the Messi/Ronaldo axis but from an organisational stand point, we have seen some really strong sides in this era especially at the international level i.e. Spain and Germany.
@Gio @harms @Fortitude what was your own conclusions as to what was the greatest?