lol maybe a slight overreaction. but completely understandable- you just spent a bunch of money on a graphics card and you are worried, i would be too. but the truth is watchdogs is a notoriously buggy and laggy game, even with the best hardware on the planet it still performs poorly at higher settings. with your processor/gpu combo, i would say you're good to game for the next 3 years without any problems... and probably longer because if system requirements and resources for future games become so high you can no longer accomadate it, you can just lower your detail settings and be just fine. gtx 780 is a great card. the fx 6300 is an incredible value for the performance. you may want to upgrade the processor in a year or two, but what that upgrade will be will depends entirely on where AMD goes from here. seems like they are just remaking the same stuff they've had on the market for a while now. i hope they get PCI-E 3.0 into their FX line soon lol. In two years, you may just have to go with a whole new motherboard/processor combo!
Bottom line: I think you'll be okay! lol
Also, realize that IPS monitors, while AMAZING for their color depth, dont have great latency, and you will probably see some screen tearing no matter what graphics card you put to it. good gaming monitors usually have 60, 120, or 144hz refresh rate with low response times, 1ms, 2ms, 5ms tops. IPS monitors tend to go higher on their latency, with 6, 8, 12, and sometimes higher ms response times. So you MAY see some screen tearing (pixel-like blockiness when moving in games), but realize that its your monitor, not your hardware!