Webb has signed a contract to play for Toulon.
The Welsh Rugby Union has changed its global player selection policy and scrapped the so-called Gatland's Law.
It follows a criteria already used by Australia for selecting individuals at test level who do not play domestic rugby in their own country.
Ross Moriarty, now at Gloucester, has a decision to make at the end of the season when his contract expires.
"You have to feel for him".
Previously, players at clubs outside Wales required one of four wildcard picks from Gatland to represent their country, with that figure dropping to two for the 2019-20 Rugby World Cup season.
"Thinking about players who are coming out of contract and what potentially their decisions are, ones that are playing outside of Wales, are they going to be moving back to Wales?"
Northampton wing George North (69 caps), Bath number eight Taulupe Faletau (66) and Harlequins centre Jamie Roberts (93) all stand to benefit from the change.
Biggar will leave the Ospreys to join Northampton Saints for the 2018-19 campaign but sits on 56 Wales caps and, fitness permitting, should hit the magic number before having to worry about his own global future.
"I still very much want to play for Wales this season and hope I can gain selection for the autumn global squad". Fullback Liam Williams had already started playing for Saracens in England before the policy changed.
Current Wales assistant coach Rob Howley, who has twice stepped up to the lead coach role for season-long stints when Gatland has been on Lions duty, could be in the frame as a successor, while Wasps rugby director Dai Young also has his admirers. Both 17-cap Moriarty and 23-cap Francis face similar questions, with their current deals up for renewal in the summer of 2018 and 2019 respectively, while Williams can not reach 60 caps before his Gloucester deal expires.
All exiled players will still be eligible for other Welsh national teams such as the Sevens, A-side and youth teams as the policy only applies to the senior squad. We have to recognise that.
"But we know we're under pressure from market forces".