Barely have the heads stopped throbbing in the wake of Wales’ Six Nations Grand Slam celebrations and thoughts are already turning to their World Cup hopes in Japan this coming autumn. With four summer friendlies to come between now and the tournament opener with Georgia in the Toyota Stadium on September 23, is this the best chance ever of Wales getting their hands on the Webb Ellis Trophy? The pundits have their say on Wales’ chances and some views from across the border may surprise you. JOE MARLER (DAILY MAIL) If you’d asked me before the Six Nations (can Wales do a Grand Slam World Cup double) I’d probably have said no. Now I’m saying yes because you have to respect what they have done. They have shown they can win ugly and they are really developing with Gareth Anscombe at 10. They have got more depth than 2015 and they have got bags of confidence. It’s wide open but I think the northern hemisphere teams will have the edge this time. BRIAN MOORE (DAILY TELEGRAPH) It does not matter whether purists think Wales could be more attractive and less defensive. They have been good enough to see off all…