Averaging out the three extant polls for a June election, from MARC on May 10, KAPA RESEARCH on May 12, and METRON ANALYSIS on May 12, we get:
Vote:
SYRIZA 24.6%
ND 20.0%
PASOK 13.1%
ANEL 9.7%
KKE 6.3%
XA 5.4%
DIMAR 5.1%
Greens 2.2%
LAOS 2.1%
DX 1.8%
DISY 1.7%
DRASI 1.5%
Other 6.5%
Seats:
SYRIZA 123 (+71)
ND 59 (-49)
PASOK 39 (-2)
ANEL 29 (-4)
KKE 19 (-7)
XA 16 (-5)
DIMAR 15 (-4)
After seeing its vote decline by 15% but nevertheless gaining 17 seats in the 6 May election, ND gains 1 percentage point somehow but nevertheless loses 49 seats. Oh you 50-seat bonus...
Actually Syriza will not get the 50 seat bonus unless they manage to merge their coalition into one party. They are legally a coalition, and thus inelgible, so even if they placed first in the popular vote and ND second, ND would get the 50 seat bonus (assuming, again, that they are still a coalition). I would hope that would be enough to spark major riots.