The question is very interesting, however there are two argumentative angles to see its valid legal end;
1. Say if a seasoned lawyer is hired by husband then husband can press for "sufficient reason not to live with husband grounds" recorded as materials of court and get the whole of maint. suit on just first hearing dismissed without getting it on a full fleged trial stage later and then suffer with no fault of his as he loves her and does not wish to break marriage. Bze in this case wife probably after finding impotancy status of husband does not wish to live with him which is not a valid reason as medico legally impotent men are seen to be recovered with resonably sperm count mortality factors and or child adoption is other option least a marriage should not breakdown on some flimsy grounds.
or the other way to look at your question answered is;
2. The husband as far as interim maint. is concerned can't escape "meeting" interim maint. if any awarded, as "interim maint.' is direction of a matrimonial court devoir of getting into the "merits" of the case (read main grounds case) as it is a summery disposal activity of a Court. Here the merit I think she has made out is impotancy but this myth could be shattered very well medico legally but it would also result into time consuming efforts of husband side pleadings and counters and meanwhile the main que. will still remain un answered which is maintenace.
So under above stated paras, para 1 is the catch (read fine meaning of "refusal to maintain" and "neglats" as in various commenteries of S. 125 CrPC by Ld. subject experts I have read) where a very seasoned lawyer can bail this gentlemen out as by your avernments he is shown not to neglect (he says he loves her and wants to save marriage) so where is neglect / refusal coming into picture the very essence of award of S. 125 CrPC!
Now let us cover "sufficient reasons not to live with husband" so advise me is being impotant sufficient reason when medically it is proven that with medications and time this myth condition could be overcome.
Illustration: I have seen a live case of a Delhi based gentlemen who due to youthfull days Alcoholism became medically impotant to such an extent that he forced himself to embrace one fine day AA Foundation (the famous worldwide Alcohol Anonymus Foundation) to get himself out of his bad vice and now his perm count is getting better and better from having no pserms at all and meanwhile the hiccup here in this boy from Delhi's case is that he got married and wife didnot knew his impotancy history and resut he is undergoing start of similar marrital problems as in your stated case and in this boy's case his wife wants a child badly but since his impotancy level is just miracleously closer to boarderline after a difficult past having undergone chemo and having no testicles even, she deserts this Delhi boy and now threatens him of DV / S 498a / S. 125 CrPC etc but your cited situation is much interesting as it is very direct question he he.
Sir, look forward to receive other advises on this interesting question to understand logics in a better way.