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If you know this is the kind of role you want to be in a few years from now (re: the exact industry, the exact role) I don't see why you shouldn't take it. Don't worry too much about not putting in the time in IB or leaving too early. If you were planning to leave either way, then it doesn't really matter whether you leave now or later in the bridge-burning element in the grand scheme of things (since you don't plan on being a career banker anyway). And just as someone pointed out - if anything, if it's a big co - maybe your team will pitch to you as a client.

The kind of questions you should ask yourself is whether something like this can come around in several years, and then for the role - what would your role entail, and is there infrastructure within the firm for promotion (i.e., this is a track for senior management, and you will be groomed to take on more senior positions going forward vs. them hiring someone else externally). Also exit opps - which you covered as more corp dev or moving to investing role within the firm.

For the first question - I think roles like this are hard to come by. Unlike banking where the turnover is high, management roles in biz dev only come on an as-needed basis, are often very few and far in between (given leaner teams), and also because often for the role to exist, it meant someone had to leave a well-paid but better-hours type job (which doesn't happen as often as banking/consulting). Also, for a role to be so senior (just under the head of mngt. to come along) is also rare. I think if you were to hypothetically wait 3 yrs and the role is available again - my guess is, they will hire you at more or less the same title (because you are already fairly close to the top, and because banking experience can only be so valuable as industry experience).

If there is an infrastructure for you to grow internally, and build broad skill sets that would either set you up for senior mngt. or to take alternative routes like biz dev in other portco's (or the investing side), then it sounds like a pretty solid role. On the flip side, with banking - 3 yrs from now you'd be a VP level, and as you move further up the ranks in banking, there is greater emphasis on client management/origination (unless you're purely M&A/execution), and you'll have to ask yourself if you see yourself doing well in that kind of role. Also - at the VP level, you'll be making a fair amount of money (some of which is locked in as stock). At that point, it will be harder to leave and also harder for other firms to hire you (if they can't match your take-home... or pigeonhole you as a banker).

I think the Industry role could give you a broader skill set, and there have been instances where someone very senior in industry go back to banking (because they are valued for their industry connections/network and deeper understanding of said industry space vs. a banker).

Sorry if this got long, but the TL;DR is - if this is what you want to do in a few yrs, and the team has a good setup for you to build credibility both in name and skillsets - take it and don't look back.