Well yeah obviously, but the cargo compartments of a 737 are sealed. What specifically, from the cabin or flight deck, would you use to determine if there is or isn't a fire to go with the flight deck fire warning?
I would have been in constant contact with the cabin crew. Any smoke? Any heat? Any odors or fumes, strange sounds? The usual. You will never be sure wether there is a fire or not! But what you can say is that the 'supposed' fire has had zero consequence up till now. Why dismiss that crucial piece of information?
How long before signs of fire are evident? Ten, perhaps twenty minutes? Perhaps five minutes before mass panic ensures serious injury or fatalities.
You should ask yourself why you did not make a forced landing in a corn field and reason on from that point. You are constantly assessing risk and probability. If you deemed yourself safe enough to fly all the way to an airport, then why 'panic' at the last moment, whilst everything else tells you that you are probably not on fire?
If you decide to taxi to a stand, get the stairs and disembark, statistics are probably in your favor as all cargo fire incidents that I am personally aware of have been false alarms. But that isn't really a factor for consideration as far as I am concerned.
At some point a false alarm HAS to be a consideration. If not for the pax you just evacuated, then for the firemen you put in charge of opening the hold (in stead of axing a hole in your plane). Will you take responsibility for that?
Anyway, there's my case. Just make a decision and deal with it
Interesting to see your case.