I'm sorry to hear about the changes happened last week, but apparently there will be a massive change in relation to 187 visa.
From March 2018 onwards, for all ENS(186) & RSMS(187) visas the nominated position must on MLTSSL.
According to the new changes, for those who are looking to apply for 186 or 187 visa if your nominated position is now on the STSOL you'd better hurry up to lock yourself in, you still can get 186 ( Direct Entry stream) on STSOL position until March 2018.
Need 3 year working experience prior to apply both visas, which currently 186 (2 years) while 187 not mandatory.
The 2 year working commitment post visa grant may increase to 3, Main applicant's age is restricted down to 45, might be exemption just wait until more details released.
For more info, here is the immigration fact sheet.
https://www.border.gov.au/WorkinginAustralia/Documents/reforms-australia-permanent-employer-sponsored-migration-programme.pdf