I'd be borderline amazed if they stay hurdling.
His breeding screams staying chaser. Pretty much every horse bought for significant money out of Old Moon has gone over 3m. The Dams sire Old Vic produced Gold Cup winner Kicking King and Grand National winner Comply Or Die. His sire Flemensfirth farms top staying chasers with the likes of Imperial Commander, TOTG and multiple King George winners. On paper he is a Gold Cup horse in waiting and with the talent we've seen so far it stands to reason he could emulate any one of them if he takes to fences.
On paper you would think his owner (who you'd associate with staying chasers) is thinking Gold Cup long term, so for me that would rule out the Champion hurdle. After the Ballymore Willie said "It's the first time he's wowed me, I thought 'wow, what a performance' and to me that was a Champion Hurdle performance,". So on that basis, I could be wrong, but the next bit is also important. He said "It was really really spectacular. With his size, scope and pedigree our owners might decide to go chasing with him next year, I don't know. But with that performance he can go anywhere".
If the owners have their say you'd think they'd land on BANC/Gold Cup as his future - is there much point going CH? Even if you're Willie, Constitution Hill is a speedy weapon, but State Man is the reigning champ and Lossiemouth is all the rage as the new improver on the scene. Having two challengers like that to take on CH seems more than enough, wouldn't make much sense to throw in a third IMO. Seen a few people say Willie has loads of top potential quality potential chasers in the yard which could be a reason they stay over hurdles but, we know from history that at this time of the year there are 20-30 horses on that list and by the DRF there are normally only one or two that look proper Grade 1 quality.
So for me it's chasing and obviously between the Arkle and BANC. If he's as good as he's made out to be and looks, he could probably win both if he translates his ability over fences, but I think we have to try and imagine what they see him as. Sticking at 2m won't restrict him from going over much further in open company in the future, but, it's much more common to see horses with his pedigree migrate from 2m5f over hurdles to 3m in time over fences. He was awesome in the Ballymore and I never make too much of runs post festival as you have to take them with a pinch of salt, but, he raced keenly but Paul had to properly get to work to drive him out and he simply outstayed them. My point is that he wasn't flashy and he looks more of a relentless galloper type than a two mile speedster, which again goes back to his pedigree.