That seems really good that. It's a half an hour journey with all stops so the journey may take 15 minutes at 125mph! I presume we will have a 100mph max journey, so 20-25mins.
No chance at all. Line speeds from Bournemouth to Weymouth are as follows:
Bournemouth to Poole: mixed, between 50 and 70
Through Poole: 20-30
To Hamworthy: 40-70
To Moreton: 85 (60 through Wool, 70 through Moreton)
Single track section (which is almost five miles long, and has one-train working): 60-80
Through Dorchester: 20
To Weymouth: 60-85, 25 on single track approach to Weymouth
By my reckoning you'd be lucky to do that in under 45 minutes (the XC Olympic services are booked to take an hour nonstop).
Stopping trains take one hour, not 30 minutes.
And if you really think that they're going to raise linespeeds for the sake of a couple of extra services a day for three weeks...
Weymouth
doesn't need these services outside the Olympics. It doesn't even need the 2tph to London it normally gets (5-car units are rarely anywhere near full west of Poole). Stop deluding yourself.
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I would hope that the 1/2 extra Voyagers that may turn up out of nowhere would go on strengthening the XC core, not running extensions to (almost) seasonal seaside resorts.
Weymouth is barely even a resort any more. Much of the traffic there in the summer is actually heading for the Channel Islands.