Maybe I should have explained myself better, but I was tired when I made this thread and grumpy since yesterday evening there were 2 complete noobs and a hacker queueing on Euro ranked so while waiting you had to hope that those 2 newbs dont end up in your team which made the games a 3vs5 effectively and that the hacker doesnt end up in your game as people refused to kick him, because winning.
First of all, yes there should be casual 5vs5 servers to get people used to the format, so the only change to ranked is FF on. Several people already asked about it and I made a whole thread linking stayfreshshoe and RazielWarmonic in it, asking why there are no casual 5vs5 servers when the game is made for that mode. Sadly, there was no answer.
About there wouldnt be enough people to play ranked: The idea behind ranked is to be matched with players of equal skill and to climb the ranked ladder. As there are not enough players of equal skill, you basically already dont have enough players to play ranked. Its more or less a casual 5vs5 with FF on and a long waiting period. Which makes your position in the ranking system a lottery.
The system right now is, players have no clue about 5vs5 since they cant play it. So they derp around on public 7vs7 and 8vs8 server and after a few hours of playing they reach lvl 7 and ranked is unlocked. And they are not prepared for it. How should they. They have no experience with the format whatsoever. But hey, lets try it out. They get thrown into a server with people with a competive mindset, they dont know what to do and ruin the fun for other people.
With a lvl 15 or even lvl 20 restriction and 5vs5 casual servers, You would only have people playing ranked who invested some time into the game, who have experience with the format and can contribute to the match. The unlocking of ranked at lvl 20 would be something player would wait for and looking forward to. I bet right now, a lot of players are not even aware that there is a restriction on ranked as their level is high enough to play it, when they first try to.