Bitcoin is nowhere close to its peak. There will be some regulatory hurdles ahead, but they can not shut it down like e-gold because there is no central authority. As more and more people learn what fractional reserve banking is, Bitcoin is going to shine even more. It may only be a speculative value, but so is gold. Gold's industrial costs are about $200/oz and the rest is pure speculation.
Expecting numbers in the quad digits is a sensible guess. Nobody controls it, they can not be created out of algorithm pace, and everyone can send or receive. The feds may try to regulate Bitcoin, but other countries may leave it free and unregulated like China has already declared they will do.
I'd like to say that Bitcoin has gone through 2 waves. The first wave started in 2009-2011 with companies like MtGox and blockchain and others, the second wave was Bitinstant coinbase and others, but this third wave of companies is already prepping with full regulation compliant business practices, and a set of lawyers in case of any issues.
Digital currency is will be huge in the future, whether it is Bitcoin or something else, but the world is definitely moving to a cashless society and more electronic means of transferring money. And Bitcoin being used only as money is like 10% of what it can be used for. Smart properties, wills, escrows, derivatives, bonds, so much more already programmed into Bitcoin from the start.