At this point I would consider an SSD a requirement for use with Solidworks.
There is no concern about the read/write cycle any more. Modern SSDs have endurance measured in the hundreds of TB. Furthermore many SSDs are available with a 5 year warranty.
You want to make sure that you keep your Solidworks data on the SSD, this is more important than the OS being on the SSD.
Some other considerations:
- Not all SSDs are created equal. Do a little research and stick with some of the better recognized names.
- When SSDs fail it is typically complete and instant. Consider running two SSDs in RAID
- Perform a regular backup transfer of data from the SSD to your HD.