Just my two-cents. (Correct me if I'm wrong)

I dont know if DNB to be the single wholesale 5G network operator is a good idea,
but I think DNB to be the single wholesale for 2G should be a good idea ...

1. Reduce cost for MNO to maintain 2G network, as we only use 2G network for calling
2. Recall bandwidth hold by multiple telco so that those bandwidth can be use as 4G, MNO can focus on 4G network
3. Nobody will complain DNB monopoly on 5G network
4. IOT / TNB Smart meter can easily get wholesale agreement

Yes, I understand DNB dont have 2G license
Just an idea brainstorming

Gov can ask telco to shut down 3G
Of course Gov can ask telco to shut down their 2G too

After this,
Telco can reband their 2G and 3G into 4G/5G
Then Gov can re-assigning some GSM900/GSM1800 to DNB to run 2G network