I've reckoned on this since the day Frank signed the engine deal with Toyota.
He will have walked out of the office rubbing his hands together. "Half the job done!" 
Frank and Patrick aren't getting any younger. A few Toyota yen won't go amis.
When I was in the UK gimping out on every available news snippet on F1 I remember reading something that confused me. BMW wanted to buy williams out but Frank and Patrick refused, so they purchased sauber. A week later in F1 Racing there was an article saying "Williams is up for sale", Frank and Patrick wanted to sell out.
Why didn't they sell to BMW? Perhaps it wasn't at the right price? Perhaps the war with words that Williams and BMW had just had in the press soured the relationship?
I'm sure Toyota have seen the advantages of buying an existing F1 team and injecting fresh money, BMW a perfect example.
It will be a great shame to lose the Williams name from F1, just like it was all the other great names that sold out to the big boys...
I agree their best option is to get th team ready to sell out to Toyota. The day of the privateer is soon coming to an end.