Jonhard said:
7 man GT teams would mean no GC team carrying a sprinter - possibly sensible - but also vice versa. I.e. no Dan Martin at Etixx. Not sure if that matters.
Smaller teams (and short stages) happen already in women's racing, and while the racing tends to be much less predictable, you do still get the richest teams dominating.
More to the point, unclear how you could get this idea through the UCI/ASO/teams clustercuddle.
with smaller teams sprints wouldn't work as they do now, with each sprinter having 4 to 5 teammates pulling him along 5k from the finish line, we would go back to smaller sprinting trains : 1 pursuit track type of cyclist to pull from k5 to k1, 1 pilot fish for the last 700 and then you do it yourself.
Regarding rich teams dominating, of course they still would : A 7 riders Sky team is still awfully strong on a TDF : Say you have Froome - Thomas - Stannard - Poels - Henao - Nieve - Rowe... That's still scary as hell. The salary cap is another issue, otherwise you end up with a situation like in football where you always see the same teams in the final stages of the champions league. But that's another issue.
Regarding smaller teams I would go with 7 for GTs (I find it really hard to go below, its 21 stages after all you want a team to sill be able to sort of function after a pair of DNFs) and 6 for the rest of the calendar (from 8 days stage races to one day races) to begin with, but would consider going 7 - 6 - 5 with only 5 riders per teams on one day races.
Give us Liège Bastogne Liège with 5 riders per team and you will see a lot more action and quite possibly GC riders coming back to it because now where longer type of efforts can be needed (if the race gets going 70 or 80ks from the line) they have more of a chance against punchers. Same for more flander type of classic riders actually : a GVA or a Sagan or a younger Cancellara would have had their chances because as opposed to today, a more open race doesn't boil down to how explosive you are for those last 2 hills after 250k of racing.
With reduced teams you would probably see more Aquila 2010 Giro type of stages where a breakaway takes lots of times and throws the GC into a bit of chaos as well. It would basically open things up a bit.