The chance of another cryptocurrency replacing bitcoin is negligible. By saying it's negligible, I mean it won't happen. The chances are pretty much zero at this point. It doesn't matter if someone comes out with something better. This happens all the time with all kinds of products. Inferior products that get to market first and get a huge amount of momentum will run the better, smaller products out of business.
Nope
Bitcoin only has 500,000 to 2 million users. While the internet back in 1989 had more users. Dot.com in the late 1990s had around 130 million. Paypal today has around 150 million users.
Bitcoin is small fish (not even that it's more like plankton) and doesn't have any holding power and doesn't seem to be expanding its' userbase anymore, despite the good concept.
IMHO - the future is the 2.0 crypto currencies with strong communities and good distribution. The first one to gain any momentum (it's only a matter of time) will shoot past Bitcoin's small userbase.
First of all, I would like to see the source of your statistics here but either way, they are meaningless dude... how is the internet analogy even remotely relevant here? Did the internet beat out some other larger competitor in 1990s? The analogy doesn't work. The Dot.com and Paypal statistics are also irrelevant.
Your point seems to be that because bitcoin has very few users, it can be easily overtaken by a better cryptocurrency. You fail to realize two points here though:
1.) The investment in bitcoin by several multi-billion dollar companies gives it a huge amount of momentum. Furthermore, the fact that you can buy almost anything with bitcoin now on the internet gives it a huge amount of momentum. I had to buy something from Newegg.com the other day and didn't even realize that they take bitcoin until I went to check out, so I ended up just paying in bitcoin. You can't spend alt coins anywhere, and therefore their only purpose at the moment is to trade for a profit.
2.) The reason bitcoin isn't that popular is because cryptocurrencies in general are not that popular. As they start to become more popular, do you think people are going to jump onto the coins that nobody uses? People aren't going to go online and do research and find out what coin has the most robust security protocol or anything like that - they are going to choose the one that is most popular and that they can use the most easily. There are tons of bitcoin companies popping up everywhere and making the currency easy for everyone to use. This is not the case for any other coins.
Like I said, unless bitcoin suddenly fails for some unexpected reason (and by suddenly, I mean over the course of like one day or less), no other cryptocurrency is going to overtake it. This kind of thing doesn't happen slowly - it happens suddenly at once or it doesn't happen at all. Nobody wants to invest in a currency that nobody uses and can't be spent anywhere (except for people trying to turn a quick profit).