coins like ppc or doge would bring a huge userbase to blocknet which is just as important as the unique and innovative features of the current blocknet coins. so this is not about neither the one or the other , both well known coins and new innovative coins can benefit from taking part in the blocknet.
but blocknet had to start somewhere and its easier to start this with smaller coin teams. when this turns out to run smoothly i think a lot of old school coins will join and they are very welcome. If you are one hosting a service like XC private transaction by holding 1k xc you welcome them with open arms.

I think the BlockNet targets tech, not userbase. For real? Doge, gtfo with that shitcoin, it's just a plain stupid copy-paste of litecoin, no tech at all in that one.
You're right. All current participating coins are included for their genuine (and relevant) innovation.
Personally I'm not averse to large user-bases by any means though. :-)