A year from now? Possible, but I doubt it. His days are numbered. I'd bet my bottom dollar that at least one person in his inner circle has a suspicion about him. They may have been on the fence about calling in a tip to LE early on in the investigation. When the OBG sketch came out after a few months, they said to themselves "well, that doesn't look like my spouse/brother/friend." Which allowed them to convince themselves that he wasn't involved (this time) - which I imagine was a relief. So they don't turn him in, and go on with their lives without having to deal with that.
With the release of NBG sketch, I think that even if it doesn't look that much like him that just taking the OBG sketch off the table would be enough to take that relief away from the people in his inner circle. It just takes one person giving LE the right name. The press conference spurred a flurry of new tips. 3,000+ within two weeks or something, right? For my money, his name is in those tips, and it is in there more than once. And once they get his name, or if he draws attention to himself by leaving the area if he does still live in Delphi or a very nearby community, all of the pieces of their investigation will start falling into place fairly quickly. IMO.
If I was this guy, I would be turning myself in to do damage control while I still can. No videos playing on a loop on every TV station in the country of the police dragging me out of my house in handcuffs, the best chance at striking a deal where I plead guilty to avoid the death penalty and avoid a trial in which all the details of the incident become very public and being seen by all of my family and friends (without me being able to spin or explain it to them) and everyone else who knows me.
But I doubt he will do that, I would bet that until the second he gets arrested he, and we, won't see it coming.
I really hope it doesn't take him finally losing control and committing another crime to catch him, but the longer he isn't caught the likelier it is he commits another crime (IMO MOO). And that'd be the nail in his coffin. With his luck there will be video in HD next time. Again, if it were me, I'd be turning myself in before I did this again and got caught but now had 1,000x more hatred directed at me blasted all over the internet and all over TV. Unfortunately I'd probably also bet my bottom dollar he wouldn't ever turn himself in. But IMO that will not be necessary, I think an arrest a year from now is as likely as an arrest tomorrow (IMO, that is based on nothing, MOO).