If you are going to spend $2000, you are going to wish you had that $2000 back to put towards your Thermal in another year or two. LOL. Really, I struggled with the same thing, and spent money on night vision Gen 1/2/3 before biting the bullet and getting a thermal. Now I hardly even touch my regular NV stuff. Thermal will spoil you but quick - and i find I use it for LOTS of stuff, not just hunting pigs. In fact, I rarely go out in the field after dark without my thermal nearby - and have been known to sit for HOURS after sunset - until the wee hours of the morning - just watching critters with the thermal.
Besides a weapon sight, you can use it to do surveys, look for lost/downed animals, or just get an idea of what is coming while deer hunting before daylight. In west texas, you can use it to spot Mulies at great distances, across canyons, etc. where regular binos would be hard pressed to find the animal. If I had a dollar for every time I've located an animal with the thermal that someone next to me couldn't see with binos, I'd probably have enough to buy another thermal.
That being said, thermal is not perfect. First, it DOES take a while to get to distinguish animals, especially at distance. Determine hogs from deer is USUALLY not much of a problem, but so far as telling bucks from does, or axis from whitetail, or what that low "blob" is (cat, rabbit, fox, etc.) - it gets much more difficult and takes practice.
Secondly, they are a real b-i-t-c-h to try to sight in. With only a thermal signature, most targets will look like a big blob and you will NOT be able to tell where you are shooting without a spotting scope. The probably comes in with trying to put the crosshairs on the exact same spot after subsequent shots to make adjustments. And the digital offsets are not as easy as "dialing to the hole". Most regular scopes take me exactly 2 spots to sign in perfectly. With my thermal, I am lucky to get away from the range shooting 2 boxes.
Maybe I am doing it wrong - but I really have trouble sighting it in - and NEVER have been able to get pinpoint accuracy - if I can get it within 3-4", I am happy! Last time, though we had it sighted in, but my future S-I-L used it on a group of pigs at like 20 feet and fired 7 times at head shots and nary a pig dropped. Still trying to figure what's up with that....
Third, you can't see antlers - unless they are in velvet, or you are really, really close.
Fourth, sometimes - you can have trouble picking out a single target from a group at distance. For example, you have 6 pigs under a feeder at 150 yards - you might see one big blob and not be able to distinguish individual heads. The good news, at night with a thermal, you can usually walk up to pigs and get 30 feet away no problem.
Fifth, the lower end thermals (up to $5K or so) get really fuzzy really fast when you start to zoom. My thermal is crystal clear and sharp at 1x, a little fuzzy at 2x, but still usable. But at 4x, it is really grainy/fuzzy. But if you spend a little more, and get more photosensors - this problem goes away with money.
At first, I had trouble justifying $5K for something just to kill pigs - but now that I have one, I can use for so many other things - it is WELL worth the money. I've had mine for just over a year now, and I have probably used it 600 hours already. I wish I had another one, so I can leave one sighted in on the gun and another I can use as a monocular just to spot stuff.
Oh, BTW, it works great on the water at night when boating.