Sorry, I was a little firm in my objections previously. I personally would welcome such a service and would use it, particularly if it ran to Blackburn or Preston after Hebden Bridge. I just think it's a tough sell to those in charge of allocating limited capacity to the various different service options. You only have to look at the Huddersfield to Bradford service, the Huddersfield to Sheffield service, and especially the old Huddersfield to Castleford service that was lost for years before getting a partial replacement with the extended TPE Manchester stoppers. Services which don't serve Leeds or Manchester (or both) get neglected and are the first for the chopping block when things go belly-up.
One indication of the likelihood of success for a new service is whether a bus service exists for those journeys. Huddersfield to Halifax has multiple double-deck buses per hour on the most direct route, plus a mixture of full-size singles and minibuses on a few other hourly routes. Huddersfield to Hebden Bridge has a few minibus trips per day, and Huddersfield to Rochdale has nothing at all (and hasn't had for decades).
