I prefer throttles for the level of instant control it gives you over pedal power to electric ratio. I'm "only" 36 so not exactly old age yet. But a rest is also good as I use r commuting - if I feel a sweat coming on I can go all power and no pedalThrottle are a bit controversial, but they seem to be important to some people. Older people benefit from being able to stop peddling to take a rest. It seems that due to EU regulation, it is unlikely we will see higher speeds.
There is no regulation governing maximum range, and so we may see improvements here. We are still waiting for a better battery. No doubt there will be small incremental improvements, but it is unlikely that we will see an order of magnitude improvement in battery power to weight ratio. Unlikely, but not totally impossible.
As for batteries - I read a lot of tech websites and there are new battery tech announced near daily. None of them ever seem to go anywhere - others more knowledgable than me hugest this is to attract funding
Still I prefer to live in hope that one of the plethora will be real and a big leap is just around the corner*
*how far is the corner is the question here !