Thank you all for your comments so far.
I've been internalizing what I've been reading and realising that the word "dispensation" may not be as cut and dry as I once previously understood it to be. I think this former thinking was from sources like "Preach my Gospel" where terms may be broadly simplified, for example:
Lesson 1- "Whenever people choose to disregard, disobey, or distort any gospel principle or ordinance, whenever they reject the Lord’s prophets, or whenever they fail to endure in faith, they distance themselves from God and begin to live in spiritual darkness. Eventually this leads to a condition called apostasy. When widespread apostasy occurs, God withdraws His priesthood authority to teach and administer the ordinances of the gospel.
Biblical history has recorded many instances of God speaking to prophets, and it also tells of many instances of apostasy. To end each period of general apostasy, God has shown His love for His children by calling another prophet and giving him priesthood authority to restore and teach the gospel of Jesus Christ anew. In essence, the prophet acts as a steward to oversee the household of God here on earth. Such periods of time headed by prophetic responsibility are called dispensations. Such periods of time headed by prophetic responsibility are called dispensations."
So this line of thinking caused me to conclude that each new "dispensation" had to have been the result of a loss of priesthood, rejection of prophets, or distortion of the gospel. As a result God withdrawing his priesthood and therefore the people needing one to restore it again much like Joseph Smith did in this last and current dispensation.
So it's been very eye opening to see for example that Adam to Enoch, yes there was some apostasy going on in some circles, but the Priesthood was still on the earth. God hadn't withdrawn it completely like Preach My Gospel kind of generally would have me believe would have been the case. Instead it and was passed from Adam directly to Enoch. (D&C 107:48). So looking at it more as "Bill "Papa" Lee mentioned, not as an "ending, but instead an evolving into another" is actually very helpful.
For me this also gives more meaning to what has been referred to as "The Great Apostasy" (the time prior to Joseph Smith where there was zero priesthood power and saving ordinances on the earth). It becomes more "great" when you compare it to some former dispensations where the priesthood was either smoothly passed on (Adam to Enoch) or there was still part of the priesthood intact (Abraham to Moses).
So again thank you all for opening my mind up more on the the meaning of dispensations.