You must do Namba at night.
There is a large section of blocks in the south eastern part which have an excellent variety of food, which you will be spoilt for choice. It is my favourite reason why I go to Osaka.
Also, if you enter Namba from a little wooden bridge, the side with the neon running dude, just as you enter the mall to your right is the best tempura I will guarantee you will ever taste. Not gluggy, soaked in oil, or tasteless, but very crisp and full of flavour, and especially good with beer.
Yes, that’ll be a factor, but I suspect the fact that most developed countries have shit the bed over this they are expecting an influx of people needing hospital treatment.
Hopefully it’s a rare case of locking the door before the horse bolts and we ride the wave out without too much pressure on the NHS.