There are two major hurdles that all of the altcoins have. The first is that it will be much harder to build a userbase to critical mass in a world where bitcoin does a pretty good job.
The other, more difficult problem is building trust in the underlying mechanism. The systems have to be open to take advantage of Linus's Law "given enough eyeballs, all bugs are shallow", but there has been such a proliferation of altcoins that I doubt there are enough skilled eyeballs to go around.
There are a lot of people jumping on the altcoin bandwagon hoping to be the next Satoshi. It is almost certain that some of those altcoins will have fundamental flaws. If they fail catastrophically, the reputational damage will, no matter how unfairly, impact upon all of the others. That will make the job more difficult, even for the worthy contenders.
The other, more difficult problem is building trust in the underlying mechanism. The systems have to be open to take advantage of Linus's Law "given enough eyeballs, all bugs are shallow", but there has been such a proliferation of altcoins that I doubt there are enough skilled eyeballs to go around.
There are a lot of people jumping on the altcoin bandwagon hoping to be the next Satoshi. It is almost certain that some of those altcoins will have fundamental flaws. If they fail catastrophically, the reputational damage will, no matter how unfairly, impact upon all of the others. That will make the job more difficult, even for the worthy contenders.