Uh... What? I think if I made a list of 10,000 things I would have expected to happen in the gaming industry, an official PC release of IIDX would have not been on that list, especially given Konami's current trajectory.
The one major concern I would have is with pricing. People say that per-play pricing would kill the game... but that's how arcades work, is it not? And this series is approaching 20 years as an arcade release. The one issue there is that it's not up to date compared to IIDX Pendual/Copula/Banana, so I can't see how they would justify a premium price.
If they go with pet-song DLC, I would expect pricing similar to the mobile Jubeat/Reflec Beat games (500y for 4 songs), maybe with a discount for a whole style.
Is this real life?
I know the lag would be less than ideal, but I hope there's some way for me to plug my modded PS2 IIDX controllers into my computer and use them for this.
The lag on modern IIDX cabinets is actually not that great, mainly due to the panels they ship with. However, the most important thing is to make sure the timing is
consistent, so as long as your controller/keyboard has a high polling rate and the display lag isn't atrocious, you should be OK. Even the arcade version has configurable timing offsets now.