Alan Sugar may say what he thinks out loud, but that is rubbish and you can't make people say that in an interview. Do they ask the same thing of men? Do they ask if older staff who are due to become grandparents (ie many members of the board of directors) whether they may take more time off to entertain grandchildren? That's a breach of discrimination laws and we are now told if interviewing staff we cannot say that.
How about asking potential law breakers to declare whether they might intend to lie - or commit a crime - or bankrupt the company - anytime soon. (More reason for asking that as maternity leave or having children isn't against the law but committing a crime is!)
If Alan Sugar seriously believes what he suggests is a good thing, then he will bring UK companies back down to the level of underdeveloped or right wing societies where women can be fired for getting pregnant or men can have their pay withheld for falling ill and other unfair trade practices. Frankly, I think he is just attempting - and not very cleverly - to generate publicity.
As for The Apprentice winners going on maternity leave, you can hardly blame them given the sort of treatment they have endured on the show!