1) Monero is going to be bigger than it is now. Not just because of its "anonymous" feature, but also because of its inflation, which is already lower than Litecoin and eventually will be lower than Bitcoins...
There is no way of global adoption, this is the aim of every cryptocurrency - if you are fine with Monero being niche coin it is ok.
Just don't expect it to get bigger without being suppressed by authorities first.
Every currency suppose to investigated by financial authority to prevent any black market or money laundering activities.
Even bitcoin now has been questioned by government about whose used it in order avoid taxes.
Monero had grown more than 2000% last year and keep increasing, but wait until it facing many problems as bitcoin did.
But, we can expect that an alternative altcoin will overcome obstacles and pass through government regulations, just so hard to determine which one of many options.
Among the current popular altcoin? I think those that have no anonymous feature. AS what Sundark said, anything that the government failed to regulate will automatically shutdown or blocked within that country's jurisdiction. Why does bitcoin stands because bitcoin does not have that anonymity feature. Transactions can be track. Even FBI stated that they can easily track coins that pass thru mixer. They said mixer just have an exaggerated claim and that they are not what they claim they are.
How can the FBI trace through coins that went thought helix while using Tor? I just don't see it.
Monero already had his time, 2000% was a ton of gains, we can never get those kind of gains again, unfortunately, at least that's what I think realistically, we will go through ages until we get to the last ATH.
We need something else. That PASC coin pumped hard recently, that's what I was talking about when I said some random alts are like a lottery ticket. Why did that pump so hard anyway?