You should have received another email, the first one was sent in error, was distributed to all the Syscoin holders on Poloniex and was assuming that Syscoin had already been delisted (which it will next week).

I wish I could provide you more information about Poloniex' business decisions, Poloniex has been delisting many coins on their exchange.

We aren't able to comment on the state of affairs of another corporation, this last list was quite a shock as it included long-term, committed staples of the Crypto world like:

Namecoin, the world's first alternative coin,
Peercoin, another veteran coin, founded in 2012
Syscoin, the world's first decentralized marketplace, and with the Syscoin 4.0 ethereum bridge, we are bringing scalability to thousands of DApp developers.

Their explanation is the following:

"On June 4th, Syscoin will be undergoing a software upgrade. Due to the engineering cost of performing this upgrade, Poloniex will not be able to continue supporting SYS at the time of the upgrade and will be delisting it."

Development costs are extremely minimal, running a node is low cost, upgrade costs are a question of a couple of hours for a developer to operate. The last upgrade from Syscoin 2.0 to 3.0 took Poloniex a couple of months yet most exchanges upgraded the same day.