We do not know for sure if Prem is really going to die in one of the future episodes!
Let us assume that is the case & examine what purpose it can achieve in story's progression.
First of all CCTV footage might say only a part of the story!
That is Ayaan did not cause those injuries, including 'neck bite'!
Then how did it happen? Surely Maya & Samay are not going to reveal anything!
The medical reports are strong & genuine as the DNA samples matched with Ayaan!
So, how to prove the 'neck-bite' drama?
Maya-Samay connection via telephone link fizzled out without ringing any alarm bells!
So, the task is to expose somehow Maya-Samay criminal link!
If Samay is going to play dirty with Prem & succeeds in silencing him on CCTV exposure & that leaves some new clues for linking Samay in this conspiracy with Maya, then some hope is there to solve 'neck-bite' problem! But how this is going to play-out is not clear!
One thing is sure, it will derail Samay-Saanjh's Shadhi!
And Samay will be only happy to stop that function! But Maya will not be pleased with Samay if her plan is going to fail! Will the rift between them generate an opportunity for Saanjh to dig out their connection ?
And thereby expose 'neck-bite' incident as well?
We can only keep speculating, till the real drama unfolds!