The majority of the Legislative Council could be occupied by party members should two high-profile candidates win seats in the May elections.
This has prompted a call from former independent MLC Greg Hall for consideration of a unicameral system of parliament.
Former television newsreader Jo Palmer was this week endorsed by the Liberal Party to run in Rosevears; the seat held by independent member Kerry Finch for the past 18 years.
Labor also endorsed popular general practitioner Bastian Seidel to run in Huon against independent incumbent Rob Armstrong.
Former Legislative Council president, and independent member, Don Wing said the Tasmanian Legislative Council would be the least independent it had ever been if the seats were taken by party candidates.
"It was getting to a dangerous level in terms of maintaining its independence 15 or 20 years ago," he said.
"And it could get to that stage now.
"The Legislative Council in Tasmania is the only one in Australia that has maintained a majority of independent members since its inception."
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There are two Liberal members and four Labor members in the chamber's make-up at present.
Should two more party candidates be elected, it would mean more than half of the members would vote consistently along party lines, except in the instance of a conscious vote.
Mr Wing said Ms Palmer's decision to run as a party candidate could potentially damage her success in winning the Rosevears seat because of a Tasmanian predilection to vote independent.
"Jo will poll well as she is respected and very popular but standing as a party candidate will cost her votes," he said.
Mr Hall said he entered the upper house in 2001 when there were five Labor members and one Labor independent member in the chamber.
He said the chamber seemed to work effectively in terms of scrutiny of bills and subsequent amendments, although this was possibly because Labor was in government at the time.
"If we end up with parties dominating the house of review, we should consider a look at a unicameral system of parliament," Mr Hall said.
He said Queensland Parliament operated under this system and bills were scrutinised by committees before they were introduced.