With the recent shutdown of new subscriptions, the absolute shitshow that was their sSIM support, and with 'upcoming changes' being the only vague communication current customers are getting, should I be concerned about what might happen to the service?
Seems to me they aren't doing so hot.
Optus bought GoMo Australia. Now it appears to have decided to shut it down. But the fact its owned by Optus means there's no reason to be concerned about losing your service. The only question is what name the service will continue under, and at what price.