While I do believe that this secession occurring now could, key word could, turn into something larger, I will have to disagree with you when you say more people would support secession today. As far as resentment goes for the government, yes it is high, but I don't think it is nearly as high as it was back in the 1860's. Also, the country and military are a little more structured and formalized than it was in the 1860's, so it would be harder for the military and political figures to split in half from the main country. It's possible, but in my opinion not probable. Just my opinion.I think there may be more people who would support the seceding states today, though.
I'm not saying that they don't have the right, but as a student of history I must bring to your attention some information that I don't think you're putting into consideration. The reason Texas asked to join the united states, was because they were broke, they had absolutely no money because they couldn't support themselves. This may be different today, but back then that's why they stopped being their own country. Also, in regards to C5GUY's post, that is why if they secede, there is going to be fighting. Because the states that secede aren't going to not use the roads and infrastructure, so there will be tension on that, but I do see your point.Texas was already its own nation from 1836 to 1846, the Republic Of Texas. They even had their own president, Sam Houston.
And they still hold the right to secede from America.