It's a sad day for Yappari users since Yappari and Whatsup for Harmattan are the best whatsapp clients you can get now days.
I did always used nitdroid or kept a dumb phone in case a situation like this would take place.
I do rather see a better Tox or Telegram cliënt for Maemo instead of a new whatsapp service cliënt.
I'll keep using my N900 even if the whatsapp server connection can't be fixed