These M2M devices are not the ones used in your home but mainly by the enterprise segment for their business needs, like for example as the article states, Airtel's M2M offerings include Smart Metering, Asset Tracking Solutions, Equipment Monitoring Solutions and Traffic Management Solution. So commercial retail mobile number series that operators issue sims for currently start with 9xxxxxxxxx, 8xxxxxxxxx, 7xxxxxxxxx, and recently started with 6xxxxxxxxx. Once these M2M sims get migrated to 13 digit format then the series starting with 5xxxxxxxxx, 4xxxxxxxxx, 3xxxxxxxxx, 2xxxxxxxxx, 1xxxxxxxxx will also become open to commercial retail mobile use. This will be sufficient to cater to the growing number of wireless users for the next few years without needing to progress to 11 digit mobile numbers.
Along with this, the number of mobile operators is reducing due to mergers and acquisitions leading to consolidation of telecom sector (Down from 14 few years back to 4 by next year). Where a single user used to have multiple sims of different operators (one for calling, another for data, one for home circle another for roaming, etc.) this trend is now changing in favour of single sim usage thanks to all in one bundle plans launched by operators after Jio's entry. The reduction in multi sim ecosystem will in turn lead to an increase in number of dormant sims which will be deactivated by operators and then the numbers will be recycled. This will further delay the need to moving to 11 digit mobile numbers.