I guarantee that an early draft of TFA had Luke doing something similar. Would have been awesome if it had happened that way instead.
I’d love to see Luke wield a blaster again. Not sure how that would work with the new persona though.
He could use it as a last resort.
If anything that void will be filled by Rey using her staff and blaster along side her Lightsaber. Han giving her that blaster pretty much confirms that it’ll stay with her for a while.