Who said anything about everyone using a foldable bike (all bikes are portable)?
Your first argument was that people couldn’t use public transport because of the last mile issue. That only affects a subset of passengers and is answered by folding bikes.
Your second argument is that it would impossible to operate a subway if passengers were allowed to bring a second cabin sized carry on bag on (that’s roughly how big a folded Brompton is).
Well there’s already plenty of examples where operators are already doing this successfully.
The London Underground for example operates just fine allowing folding bikes to be taken on at all times of the day.
Your first argument was that people couldn’t use public transport because of the last mile issue. That only affects a subset of passengers and is answered by folding bikes.
Your second argument is that it would impossible to operate a subway if passengers were allowed to bring a second cabin sized carry on bag on (that’s roughly how big a folded Brompton is).
Well there’s already plenty of examples where operators are already doing this successfully.
The London Underground for example operates just fine allowing folding bikes to be taken on at all times of the day.