It matters for one who makes such claim, but it do not have to matter for others, most notably, devs, FS users and so on.It matters definitely, if you claim, "I only a few years time, BTRFS will be on every Hard Drive".
And if we're about filesystems for removable storages, MS preferred to be utterly uncooperative. They created exfat which isn't anyhow noteworthy from technical point of view, uses ancient disk techs, etc. Yet it is patent-encumbered and requires to pay royalty. Isn't it cool to pay for ancient and outdated techs? So MS shouldn't complain if others do not want to cooperate with such vendor at all.