<human>: I've got a young friend who is moving with her kitty from a small apt. situation to renting a house that's quite a bit of space for just her alone, so she's planning on bringing in a house-mate or two. She's just been contacted by someone who could be interested in moving in to the new place with her, but it turns out that she has a cat too -- a totally indoor cat who is blind.
In my own admittedly limited experience it is almost more likely that two middle-aged cats suddenly expected to share the same house will NOT get along than that they will. I know one couple who have had the same two cats, always incredibly sweet and wonderful when alone, who are literally at each others throats whenever they physically cross paths. And this situation has gone on for YEARS. I also agreed to have a friend 'drop off' his cat at my place while he was off for 10 days on vacation and, naive as I was at that time, I had no idea that this would be 10 days of 'growling' and tension and physical combat and just a completely impossible situation between our feline friends. 
So, my question is, do two cats, total strangers, ever truly stand much of a chance of "striking up an immediate friendship" when moved into the same limited space? I mean, I KNOW that it's 'possible' -- but is it as 'unlikely' as it seems to me? Or has my view been jaded by experiences which, to others here, seem UN-characteristic in the end? 
So, in addition to any event-stories that might be relevant what I'm really trying to get a sense of is the sort of 'overall statistical likelihood' (if that were possible!) rendering that I can offer her to help her in her decision on whether to keep hers the only cat in the house or to open the situation to others.
Thanks for any thoughts on this!

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: how likely is it that two cats - complete strangers - will 'get along fine' in being made to live in the same limited space from their owners moving in together as roommates?