When can we do 2 laps is a common question from fans and the short answer is that we could do 2 laps now.
However the problems with going that route are threefold; firstly, so far only 4 bikes have completed 100+mph laps (2 x MotoCzysz, 2 x Mugen), so if you suddenly introduce a 2-lap race you reduce even further the potential number of competitors who can compete, and/or make it more difficult for new competitors to join.
Then, even at the current rate of development, doubling the distance will decrease the speed. We have worked hard to make the performance credible in comparison, and if you are suddenly back to sub-100mph laps you invite further criticism.
Finally, the actual pace of development can demoralise existing, or scare away new, competitors.
The problem is we can't slow our pace to allow others to catch up, because as the technology continues to open up performance potential we have to keep chasing it otherwise we could get caught with our pants down by any new entrants, so we are damned if we do and damned if we don't.
The speed development has not plateaued yet, it could be 117 (unlikely), maybe 120+, or even 130, who knows?
The obvious answer is that we need more bikes of similar performance on the course, but we are possibly one "Eureka" moment from some major avenue of development breaking away from the current solutions, leaving the others sitting on the wrong branch of the tree. This may be why we don't see the major players rushing to join in, it could be they need the technology development to stabilise before they invest the many millions they (as major manufacturers) would have to . Of one thing you can be sure though, every serious player has a whole army of people, and lots of investment, looking at utilising electric power, so it will come. It is just that no-one can honestly say whether it is going to be 5, 10 or 50 years before it goes mainstream.
Sorry for the long answer, but it is a complex topic, with no easy answer.