Sorry, I didn't word that too well. What I meant to say that the Zones 1-6 / 1-7 are rail only, Zones 1-5 plus the additional one specified Metro products designed specifically for people commuting from Harrogate & Skipton into or out of West Yorkshire. They are not the same as the Zones 1-5 (and below) which are train & bus, valid for all specified rail zones, & fully transferable passes. The T&Cs for these changed quite a bit once they become MCards, issued on smartcards, so I honestly cannot remember what they were previously. But I would be very surprised indeed if a holder could request a taxi from a TOC in the circumstances as discussed here. I would have thought the following would give the TOCs the room to refuse on the grounds that it is a multi-modal ticket.
https://m-card.co.uk/terms-of-use/mcard-general-terms-and-conditions/
I for one would not be banking on that if I found myself in similar circumstances to the OP, I would always have a back up plan (usually enough cash on me to get a taxi if all else fails). That's not to say that a supervisor of a TOC may not order a taxi, and in the case of the OP it was more appropriate as they held a rail only pass which also had the advantage of being for the route where the delay was incurred. But as a rule of thumb I wouldn't expect it to be an automatic right, more to the discretion of the TOC. I did try to find the T&Cs for the Zones 1-6 pass, but WY Metro seem to have server issues this morning so many pages aren't loading.
If my train is delayed and it causes me to miss my connection, I expect the train company to get me to my destination or find accommodation, regardless of what type of ticket I have. All this tripe about making sure I carry thirty pounds in case Northern Rail can't be bothered to fulfill their obligation is obfuscation.