New NAS?

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Yes, you would need a fairly fast NAS for this. If you prefer Synology then DS1621xs+ would be a good option. Otherwise TVS-872XT or TVS-1282T3. Qnap comes with Thunderbolt ports. This way you can save and not get a 10GbE switch until you have a team of editors. But certainly, you need to consider speeds around 300-400MB/s per 4K editor. You can achieve this with intel core I or Xeon based NAS with at least 8 drives. Qnap internal M.2 NVMe is really fast SSD. Many people use it for actual storage instead of the cache, simply because of the speeds. HDD array than can be used for finished projects. But it still helps even if you do use it as a cache.Filling bays with just a few SSD would also help a lot regards the access speeds and data transfers.It is very wise to keep an old NAS and set up an automated backup. This way if disasters strike like flood/fire/theft, your data is duplicated somewhere (backup NAS do not even need a RAID). Or you can mount your old NAS with your new NAS. Just like you would map it on a computer.When starting out, you start with just 4 drives and add more as you need them. There is a simple drive expansion procedure without any reset.I hope this helps.