There are already Verilog and VHDL based tools alvilable. i think nopne likes to learn a third HDL. Including specific ideas into the hdl makes it less attractive to people
Each HDL has its own strengths, weaknesses, tool support & application areas. So each has its place as long as -for specific designs/projects- it's better than alternative HDLs. Users can define "better" for themselves.
Not to mention: existing designs already done in Verilog, VHDL or whatever. Converting such a design from one HDL to another may no be easy.